Mechanical stoker.



No. 850,919. PATENTBD ABR. 23. 19o?.

LfPRIDEz. Y

MECHANICAL sToKER.

APPLIOATION FILED JULY 23. 19.06.'

2 SHEETS-SHEBT 1..

101850,919. PATENTED APR. 23, 190'?,l

' L. PRIDEZ. l

MECHANICAL S'IOKBR.V

- APPLIOATION FILED JULY 2s. 190e. v 2 SHEETS-SHEET 2.

LOUIS FRIDEZ, OF BUFFALG, NEW

MECHANICAL STOKER.

Specification of LettersA Patent.

Patented April 23, 1907.

Application led July 23, 190B. Serial No. 327,317.

the county of Erie and State of New York,

have invented a new and useful Im )rovement in Mechanical Stokers, of which t e following is a specification.

This invention relates more particularly tothe class of furnace-stokers comprising rows or series of rake-fingers adapted to enter between the grate-bars and means for moving the fingers back and forth and up and down, so as to loosen. the fuel and sift the ashes through the grate.

One of the objects of my invention is to provide a simple stoking device of this character which eifectually acts upon all portions of the fuel.

A further object of the invention is to soA construct the stoking device that the same can be adjusted to feed the fuel backward more slowly on the rear part of the grate than on its front part when the fuel burns slowly, owing to the checking of the draft.

In the accompanying drawings, consisting of two sheets, Figuie 1 is a fragmentary longitudinal section of a steain-boiler furnace provided witli the improved stoker, showing the raking-frame elevated to the same level 4at both ends ofthe grate. Fig. 2 is a horizontal Section in line 2 12, Fig. 1. Fig. 3 is a transverse section in line 3 3, Fig. 1. Fig. 4 is a section similar to Fig. 1. showing the rear end of the raking-frame lowered. Fig. 5 is a fragmentary longitudinal section in line 5 5, Fig. 2. Fig. 6 is a transverse section in line 6 6, Fig. 5. v

Similar letters of reference indicate correspending parts 'throughout the several views.

A indicates the barsof the grate, which may be of any ordinary construction.

The stoking device consists of a rakingframe comprising longitudinal rake-bars l5, arranged below the grate and carrying rake fingers or teeth b, which extend upwardly therefrom and pass freely between the gratebars. The longitudinal rows or series of rakefingers extend nearly from end to end of the grate, and each rake-bar B may carry one or more rows of fingers. ln the construction shown three'rows are secured to each rakebar, as seen in Fig. 3.

The rake-bais are carried at or near opposite ends by the cranked portions of a pair of transverse crank-shafts C C', which extend across the ash-pit, and are journaled in the j", which is connected with .the fuel back and forth.

side walls of the furnace. As shown in Figs. 1, 3, and 4, the rake-bars are provided with suitable bearings d, which embrace the cranks of said shafts. These shafts extend through one side of thefurnace and are suitably geared together to turn in unison. In the preferred construction shown they are connected by a sprocket-cliain e, passing aroundsprocket-wheels e c2, secured to their projecting ends, and they are turned by a hand-crankf, secured to a longitudinal shaft the front cr shaft by beveI-gearsj'z. This liand-craiillllis arranged at the front of the furnace, where it eai be conveniently operated by the attendan The cranks of the shafts C C are arranged 1n correspondin f positions and are of the same length, so t iat upon rotating the shafts all the rake-fingers nieve backward and forward andup and down to the same extent the rear fingers of the raking-frame as weli as the front ones movin in circular paths In the operation of t ie device the continuous rotation. of the crank-shafts C C in the direction of the arrow causes the rake-fingers to be moved upwardly and rearwardly dure ing a half-turn ofthe cranks and downwardl and forwardly during the other half-turn thereof. The throw of the cranks is such or the fingers are of such a length that the latter proJect above the surface of the grate durinor their rearward stroke and recede below said surface during their forward stroke so as to loosen and stoke the fire and at the same time g'allually puslli3 the fuel toward o t egrate. causing the tr rows of fingers iiswell zs the ansverse rear not displace the fuel both forward an ward, but only backward, thus avoidtiinkgafie formation of a gap or opening in the fuel upon the rear end of the grate, which occurs by the use of devices m which the rake-fingers move When such gaps stroke when they are projected the fingers do the rear end front rows to roo are formed, the rear end of the grate is uni covered, allowing cold air to ascen the same and cooling oil the furnadiel iiiird pairing the draft. By th struction herein shown and described th rear as well as the front rake-iin e Stoker are below and out of I1eachgers of the during their receding stroke thus o displacing; the fuel only in ai rearvilgaii'lhldidc tion, keeping the grate covered and prevente improved con...

IOS

of thev fuel IIO ing the formation of such cold-air gaps or assages.

When the draft is checked, the fuel burns slower on the rear portion than on the front portion of the grate, and it is therefore desirable to feed or push the fuel backward more slowly or to a less extent on the rear part of the grate under these conditions. y accom lished by lowering the rear portion of 1o the ra ing-frame relatively to its front portion, as shown in Fig. 4, so that the fingers project into the adjacent portion of the fueled to a less extent than the front fingers, and hence have a reduced displacing or feeding action on the fuel. QIn the preferred construction shown in the drawings rear crankshaft C is for this purpose arranged in vertical slots or vertically-elongated bearings c, as illustrated in Fig. 6, and is supported at zo its ends upon rotary cams or eccentrics g, secured to opposite ends of a transverse rockshaft G, journaled in the side walls of the furnace below the rear crank-shaft. One of these eccentrics is providedfwith an arm g', to which is connectedv an operating-rod H, which terminates at the front of the furnace. Upon turning this rock-shaftby means of the rod H so that the Wide portions of the cams are presented to the shaft the latter and the 3o rear ends of the rake-bars are raised to their normal position, inP which vall of the rakeiingers project above the surface of the grate to the same extent, as shown in Fig. 1, while upon turning the shaft in the opposite direc- 3 5 tion the narrow portions of the cams are presented thereto and the rear portion of theraking-frame is ,permittedl to descend, as shownin Fig, 4. v

The operating-rod/Hinaybe locked in posi- I 4o -tion by any suitable means. The preferred device consists ofa bracket H for the rod,v

secured to the front wall of the furnace and provided with a clamping-screw h or other suitable means, by which the'rod may be se- 4 5 cured in either of its positions.

A dumping grate-section Imaybe arranged at the rear end of the main grate, if desired,

` 'this section forming rio-part `of my invention j and being operated by any suitable means. 5o Iclaim as my invention- 1. The combinationof a rate, front and rear crank-,shafts arranged elow the same and both capable of complete rotary movement, actuating mechanism for said shafts,

.55 and a raking-frame carrying rake-fingers which enter between the grate-bars and having its vend portions j ournaled upon Ithe l cranks of said front and rear shafts, whereby all the fingers of said frame move to and fro 66 and up and down in'circular paths and dis- This is 'place the fuel only in a rearward direction,

substantially as set forth.

2. The combination of a rate, front and rear crank-shaftsl arranged elow the grateand both capable of complete rotary movement, gearing connecting said shafts to cause the same to rotate in unison, and rake-bars arranged lengthwise of the grate-bars and carrying rake-fingers which enter between the grate-bars, said rake-bars being jour- 7o naled at opposite ends upon the cranks of said shafts, whereby both ends of the bars and all the rai a-'ngers move back and forth and up and downin circular paths, substan-- tially as set forth. v 'h .7'

3. The combination of a rate, a rakingframe movable lengthwise o -the-grate-bars and carrying fingers which enter between the same, and means for adjusting one end of the rake-frame vertically relatively to its other 8o.

end, substantially as set forth..

The combination of a grate, a raking.- frame movable .le/ngthwise of the grate-bars and carrying lingers which enter between the same, front and rear shafts arranged below the grate and having cranks upon which thel front and rear portions of the rake-frame are 5 vjournaled, the rear shaft being capable of vertical adjustment, and means! for adjusting v,

the' last-named shaft, substantially as set 9o i forth. f

'5. The combination of a oTate', a rakingframe movable lengthwise of the 'grate-bars and carryingfingers which enter between the same, front and rear shafts arranged below the grate and having cranks upon which the front4 and rear portions of the rake-frame are journaled, the rear shaft bein capableof vertical-movement, and cams or adjusting the last-named shaft, substantially as set loo forth.

6. The combination of a grate, a rakingframe carrying fingers which enter between the grate-bars, 'front andrear Shafts arranged transversely below the grate and having 1o; cranks upon which the front' and rear pol'- tions of the raking-frame are.journaled,'said rear shaft'being capable of vertical. adjustment, a transverse rock-shaft arranged' below said adjustable shaft and carrying car-ns i lo which act upon the latter shaft, and means. for turning said rock-shaft, substantially as set forth. l

Witness my hand this 14th day of July, .1906.

LOUIS FRIDEZ.v

Witnesses i CARL F. GEYER',

GRAHAM. 

